UV LED Package Warning Structure for Visible Emission Indication
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Solution Overview
Problem
Conventional ultraviolet (UV) LED packages lack a visible indication of UV emission, posing safety and operational challenges as UV light is not visible to the human eye, potentially leading to harmful exposure and undetected degradation.
Innovation Solution
Incorporating a lumiphoric material region within the UV LED package that receives a portion of the UV light and converts it into a visible or non-visible wavelength-converted light, such as infrared, to provide an integrated warning without significantly impacting the color purity of the LED package's emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a lumiphoric material region is added to convert UV light to visible light for safety indication, then safety indication capability is improved, but device complexity increases
Solution Approach 1:
The patent combines the warning function with the existing LED package structure by integrating lumiphoric material regions into the package housing or substrate. This merging approach allows the package to simultaneously provide UV emission and visible warning indication without requiring separate warning devices, thereby improving safety while minimizing increases in device complexity
Solution Approach 2:
The lumiphoric material acts as an intermediary that converts invisible UV light into visible warning light. This mediator material absorbs a portion of the UV emission and re-emits it at visible wavelengths, providing indirect safety indication without requiring direct detection of UV radiation by human eyes
2Illumination intensity
If lumiphoric material region is made larger to enhance warning visibility, then warning indication capability is improved, but color purity of UV emission deteriorates
Solution Approach 1:
The patent applies local quality by creating discrete, localized lumiphoric material regions rather than uniform coverage. These regions are strategically positioned to provide sufficient warning indication while limiting the total amount of lumiphoric material that could absorb UV light and reduce color purity. The localized approach allows different parts of the package to have different functions: warning indication where needed, UV emission where not converted
Solution Approach 2:
The patent uses partial action by having the lumiphoric material region convert only a portion of the UV light emission rather than all of it. This partial conversion provides sufficient visible warning indication while leaving the majority of UV light unconverted, thereby maintaining high color purity of the overall UV emission from the LED chip
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The lumiphoric material region effectively indicates UV emission, reducing human exposure and enabling detection of UV LED degradation, while maintaining high color purity and operational efficiency of the UV LED package.
Implementation Method 1
a lumiphoric material region that is arranged to receive a portion of the light from the LED chip and provide wavelength-converted light
Data Source
AI summary
Solid-state lighting devices including light-emitting diodes (LEDs), and more particularly integrated warning structures for ultraviolet LED packages are disclosed. Integrated warning structures may include passive structures, such as lumiphoric material regions, that are arranged within LED packages to receive a portion of ultraviolet light from an LED chip within the LED package and provide a small amount of wavelength-converted light. Such wavelength-converted light may serve as indication that ultraviolet light is being emitted. Exemplary lumiphoric material regions may form one or more discrete regions within LED packages and may provide such wavelength-converted light without substantial impact on color purity of the LED packages. Accordingly, LED packages may provide integrated warning emissions that may serve to indicate the presence of ultraviolet emissions and/or reduce human exposure to such ultraviolet emissions.